The QSWRCH45K-B produced by XINGTAI STEEL is mainly used to produce 10.9 grade automobile fasteners. This product has the advantages of stable composition, low harmful elements, small decarbonization layer, less surface defects and so on. It is easy to carry out nodularization annealing, low cold heading cracking rate, stable heat treatment quality and good hardenability. A customer of XINGTAI STEEL uses this product to produce automobile bolts,reflecting the stable quality of the product.